432341d8a8
The existing vector transforms reduce the dimension of transfer_read ops. However, beyond a certain point, the vector op actually has to be reduced to a scalar load, since we can't load a zero-dimension vector. This handles this case. Note that in the longer term, it may be preferaby to support zero-dimension vectors. see https://llvm.discourse.group/t/should-we-have-0-d-vectors/3097. Differential Revision: https://reviews.llvm.org/D103432